Vertical-water-tube boiler.



F. J. DOYLE.

VERTICAL WATER. TUBE BOILBR.

APPLIGATION FILED MAY 1o, 1910.

l,091,736. v Patented Mar.31,1914.

3 SHEETSwSHEE'I 1.

P. J. DOYLE.

VERTICAL WATER TUBE BOILEE.

APPLICATION FILED MAY 10, 1910.

LL736 i Patend Mar.31,1914.

3 SHEETS-SHEET 2,

F. J. DOYLE.

VERTICAL WATER TUBE BOILER.

APPLICATION FILED MAY 10, 1910, 1,09 L73@ Patented Mar.31,1914.

3 SHEETS-SHEET 3.

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FRANCIS J. DOYLE, OF CHICAGO, ILLINOIS.

VERTICAIf-WATEBTUBE BOILER.

ramas.

Specication of Letters Patent. Patented Mar, 319 1914,

Application led May 10, 1910., Serial No. 560,407.

To all whom z't may concern.'

Be it known that I, FRANCIS J. DoYLE, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Vertical -Water- Tube Boilers, of which the following is a specification.

This invention relates to improvements in vertical water tube boilers and has among its salient objects to provide a construction in which the, fire chamber is substantially filled with a relatively large number of vertical re tubes extending .circumferentially of the fire chamber and communicating at either end with water legs; to provide a con struction in which the lire chamber is not only provided with vertical water tubes extending therethrough, but is substantially surrounded or inclosed by a' boiler which takes the form of the water legs; to provide a construction in which the fuel is distilled instead of being burned directly and the distilled gases ignited and oxidized While within the fire zones; to provide a construction in which any substant1al pronounced induced draft through the fire chamber is substantially eliminated and the air intro-duced by suitable pipes or other means to various points Within the fire zones; to provide a construction which secures a maximum water heating surface, whereby substantially the entire heat units tact with t e part of the boiler surface; to provide a construction in which a major portion of the heat units generated are effectively utilized in raising the temperature of the water, instead of being drawn out through the stack or chimney, as in present constructions; to provide a construction which can be readily and economically manufactured and which is devoid of any complicated or delicate mechanisms; and in general to provide an improved construction of the character referred to.

My invention consists in the matters here` inafter described and more particularly pointed out in the appended claim.

In the drawings Figure l is a vertical sectional view of my invention with parts shown in side elevation; Fig. 2 is a horizontal sectional view taken substantially on line enerated come directly into con- 2-2 of Fig. 1 vand looking in the direction of' the arrows; Fig. 3 is-a view similar to Fig. 2, but showing a somewhat modified construction; Figs. 4 and 5 are detail views showing the manner of controlling the draft through the stack.

Referring to the drawings, 1 designates as a whole the ash pit, 2 the grate, 3 the lire box, the outer side wall of which is formed by a circumferentially extending water leg, 4 the inner and outer walls, 5 and 6, which are secured together by suitable staybolts or braces 7, and are united at their lower ends by an end-closure member 8. The lower end of this water leg terminates in a flange 9, which is seated in an annular channel 10, extending around the outer edge of the grate 2. The inner wall of the lire chamber is formed by a cylindrical water leg 11 closed at its lower end, as shown at 12 and open at its upper end, as shown at 13. This water leg 11 terminates some distance short of the grate level and vforms a substantially tubular open-ended magazine 14, by which fuel may be inserted into the fire chamber in the 'manner hereinafter described. The inner Walls 5 of the main water leg 4 terminates short of the upper legs, as shown more clearly in Fig. 1. vThe upper end of the fire box is closed by a circular plate 15 centrally apertured, as shown at 16. Tothe plate 15 is secured by means of stay-bolts 16 an upper end-closure plate 'member 17, the outer edge of which is suitably bolted or riveted, as shown at 18, to the outer Wall 6 of the main water leg. The upper plate 17 in conjunc tion with the plate 15 forms an upper water space 19, which extends over the entire upper end of the lire box and communicates with the respective vertical water legs 4 and 11. The upper plate 17 is centrally apertured to receive a feed trunk 2() which communicates with the 4upper end of the magazine 14 and is provided with a removalde door or cap 21, whereby fuel may be inserted into the fire box. The arrangement just. described is such that the side and the upper end of the fire box are entirely surroundml byfw-a-ter or boiler space and in addition the magazine 14 is inclosed by the water leg ll.

As a feature of the present construction, u relatively large number ol water tubes extend vertically throughout substantially the entire height of the fire box and communicate at their upper ends, as shown at 23, with the water space 1t), and at their lower ends with the water leg 4, as shown at 24. It will be noted that in the construction shown in Fig. 1 the lower ends of the tubes are open and curved outwardly in order that they may communicate with the water space 4. As shown in Fig. 2, these water tubes extend entirely around the fire chamber, the construction being such as to permit of the use of a relatively large number of such tubes in a minimum amount of space. The lower inner water leg 11 may communicate with the outer water leg 4 by means of a plurality of pipes 11. That part of the iire chamber which surrounds the inner water leg 11 may be termed an auxiliary combustion chamber, designated as a whole 25, to the upper end of which is connected a stack or outlet pipe 26, which extends through the water leg 4, as shown more clearly in Fig'. 1. Ihe side wall of this stack is provided with ports 27, to which are connected stub pipes 28 controlled by hinged closures 29, which are normally Open. Themain body of the pipe 26 may be also provided with a suitable damper 30, which is also normally closed. This damper, however, is of slightly less diameter than the internal diameter of the pipe 26, so as to leave alrestricted outlet passage even when the damper is in closed position. The arrangement 1s such that any pronounced induced draft. through the stack 26 is substantially eliminated. Inasmuch as the fuel is distilled, as contradistmguished from a direct burning, I provide means for introducing air to various parts of the fire zones. 'lo this end a plurality of stub pipes 31 lead from the ash pit directly into the lower part of the fuel body, and similar pipes 32 lead from the ash pit to the auxiliary combustion l chamber 25. If desired, generally similar pipes 33 carry air from the ash pit into the magazine'l4. The arrangement 1s such that air is so supplied to the fuel and the draft so eliminated as to distil the fuel, and the gases of distillation are then ignited and oxidized Within the re chamber.

The upper end of the Water space 19 is provided with the usual steam dome 34, safety valve 35 and outlet pipe 36. Water may be fed to the boiler by means of an inlet pipe 37 controlled by water cock 38. A conduit 39 extends through the lower end of the water leg and permits a poker to be inserted into the fuell body if desired. As many of these conduits may be provided as is found necessary'or desirable. Access may be had to the ash pit through a suitable door 40.

In Fig. 3 I have shown a slightly modified construction in which the water tubes are lower ends, as heretofore described. Referring to this figure, the top of the ash pit 4l is provided with the usual grate 43. Upon the ash pit is supported the lower wall 44 of the boiler which is centrally provided with a trunk extension 45 leading to the fire box proper. Upon this trunk is mounted a pla-te like ring 46 which forms the lower end of the combustion chamber. The inner wall 50 of the water leg 49 is supported on the plate ring 46 and the outer wall 48 thereof extends to the ash pit. The two side walls of the main water leg are connected together by suitable staybolts or braces 57. The-inner wall of the fire chamber is formed by the water leg 52 similar to that heretofre described, and forming a generally similar central fuel magazine 53, which communicates with the feed trunk 54, as shown. The

.upper end of the device is provided with closure plates 55 and 56 similar to t-he plates l5 and 17, heretofore described. It will be noted, however, that the main boiler or water space surrounds not only theside wall and upper end of the fire chamber, but the lower end as well. The fire chamber is similarly provided with a series of circumferentially extending water tubes 57, which communicate with the upper and lower ends of the boiler, as shown.

Air is introduced to the lower end of the fire box by means of pipes 58l leading from the ash pit, and in a similar manner air is supplied to the combustion space 59 of the fire chamber through openended pipes 60. If desired, air may also be supplied to the central magazine 53 by means 0f a plurality of pipes 61 also leading from the ash pit.

The modified construction just described secures a larger boiler surface, but slightly decreases the available fuel area of the fire box. It is apparent that the fuel fills the central portion and lower end of the fire chamber, and that the gases of distillation will be oxidized in the combustion chamber. It is also to be noted that the various air pipes lead from the ash pit or in other'pwords at or below the grate level and accordingly the air, before it passes into the various parts of the fire zones, is preliminarily heated. In addition, the danger 0f the lire passing out-115 through the air ortion when, the draft is substantially eliminated, is obviated.

The invention is not limited to the details of construction shown, except as set forth in the appended claim.

I claim as my invention:

In a boiler, the combination of a main lire chamber, a fuel magazine extending vertically into said lire chamber and open o'nly at its lower end and terminating short of the grate level, air conduits Ileading from below grate level into the fuel on the grate, sep-v arated air conduits leading from below grate level to the combustion chamber adjacent the lower end of said lfuel magazine, and

1,091,736 i j l Q separate air conduits leading from below grate level to the fuel magazine above the fuel therein, the distilled gases from the fuel in the magazine miXin with the air delivered to the magazine, tie fuel magazine being devoid of any outlets except at its lower end whereby the mixture of air and distilled vgases *must pass downwardly through the magazine and into and through the hot re adjacent the lower end of the magazine. FRANCS J. DOYLE. lVitnesses:

FRANK L. BELKNAP, Lois lFoRCE. 

